5/16-18 x 1 英吋六角頭螺絲 | 美國製造 | PFC9 合金鋼黃鋅 (200 個/包)

I’ve used a lot of hex head bolts before, but these really bite cleanly with a socket—no stripping on the first tighten. The 1-inch length is spot-on for my current small-frame assembly job.

The yellow zinc coating on these cap screws is smooth and consistent, making them easy to thread even with oily fingers. I used them to secure a jig on my milling table and they seated perfectly without binding. For machine assembly, the PFC9 alloy steel feels noticeably tougher than the usual hardw

The hex head on these cap screws grabs really well with a socket, which made tightening them in tight spaces much easier. The yellow zinc coating looks clean and has held up fine so far in my garage, no rust after a few weeks. Glad to find USA-made hardware that actually fits standard wrenches witho